Speaking of endings, the first end credit scene with Sif and company giving 'The Collector' the Aether(sp), what was that about as I'm not familiar with 'The Collector' character? Is he no one important?

He's the villain for Guardians of The Galaxy and he works for Thanos. He's collecting the Infinity Gems for him (the Aether and Tesseract being two of them already revealed). "One down, five to go." He's pretty important.

__________________"Why are you trying to kill my kid?! You know what? I don't care. You got some beef with him or me? Whatever. You trying to start a rogues gallery of some sort? I ain't got half as much patience as Batman or The Flash. If he dies...so do you." - Green Arrow